In a primary manner; pertaining to the principal of a matter.

(countable) A region or sovereign nation headed by a prince or princess.

Primary; most important; first level in importance. / (obsolete, Latinism) Of or relating to a prince; princely.

(finance, uncountable) The money originally invested or loaned, on which basis interest and returns are calculated. / (Canada, US, Australia, New Zealand) The chief administrator of a school.

plural of principal

plural of principality

Misspelling of in principle.

(historical) The early period of the Roman Empire, during which some characteristics of the government of the Roman Republic were retained; the reign of any particular emperor during said period.

Primary; principal.

The quality of being principal.